Though Jennifer Aniston hasn’t exactly been doing her best to make friends with the cast and crew on the NYC set of her film The Baster, the actress might be going out of her way this weekend to help her dad — and raise some money for sick children.

Jen’s father, soap opera star John Aniston, is already slated to appear at a Manhattan Barnes & Noble on Saturday to read from the children’s book, Loukoumi’s Good Deeds. John and Jen both give voice to characters on the book’s accompanying audio CD. And sources are telling OK! that Jen might put in a surprise (well, it was a surprise) appearance to help out her dad and the other readers, including American Idol alum Constantine Maroulis.

Of course, when contacted by OK!, a spokesperson for Barnes & Noble said that Jen is not expected to be at the event.

Regardless, Loukoumi’s Good Deeds is a book near and dear to Jen’s heart — two dollars from the sale of each copy goes to St. Jude Children’s Research Hospital. The former Friends star has been a champion of St. Jude for years.